From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefan Neuwirth <neuwirt-xen-devel@trillian.hd.shuttle.de>
Subject: Re: PCI Passthru: fn0 exported but not fn1
Date: Wed, 29 Aug 2007 20:27:25 +0200
Message-ID: <87ejhm5h82.fsf@trillian.hd.shuttle.de>
References: <C2FA6F3A.D05F%keir@xensource.com> <46D58037.7010007@netxen.com>
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In-Reply-To: <46D58037.7010007@netxen.com> (Jambunathan K.'s message of
	"Wed, 29 Aug 2007 19:48:31 +0530")
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To: Jambunathan K <jambunathan@netxen.com>
Cc: xen-devel <xen-devel@lists.xensource.com>, Keir Fraser <keir@xensource.com>, Sanjeev Jorapur <sanjeev@netxen.com>
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Jambunathan K <jambunathan@netxen.com> writes:

> Keir Fraser wrote:
>>> As I worte accidently direct to Keir and not to the list, I face the
>>> same problem. I'd like to have option 1, because it worked fine and I
>>> don't see a benefit of having a dummy device in the domU.
>>>
>>> Dedecating single fnX to a domain is very usefull for example to give
>>> the domUs ethernets of a four port card. I'm also running one domU
>>> that is only using one of the USB 1.x controllers of a USB PCI addon
>>> card.
>> 
>> Okay, if you want to check out the 'fix' to revert behaviour to that of
>> 3.0.4 for yourselves, it is to edit
>> linux/include/asm-i386/mach-xen/asm/pci.h and to change the definition
>> therein of pcibios_scan_all_fns() from 0 to 1.
>> 
>> If you are building a 64-bit kernel then of course it is the file in
>> include/asm-x86_64 that you need to edit.
>> 
>> Make that change and rebuild you domU. Additionally, make sure you build
>> dom0 with pciback in passthrough mode. Hopefully your problems will be gone!
>
>
> I am using x86_64.

Same here.

> Just to be sure I 'fixed'
> linux-2.6-xen-sparse/include/asm-x86_64/mach-xen/asm/pci.h and  made a
> clean build from xen source tar. I ensured that BACKEND_PASS is set to yes.
>
> I am using the same vmlinuz both on Dom0 and Dom1. I am seeing that
> lspci in Dom1 *doesn't* report the exported non-zero function.

Same here, furthermore the system was unresponsive to my serial device
with the fix applied.

  Stefan